Malicious PDF — malware analysis report

Static analysis result for SHA-256 564109d531b73cfc…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 13:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db068be341248a7ea3875f69c5155301 SHA-1: 6f42c1f7f8624f2b35d9150029f26736dbdf5c8e SHA-256: 564109d531b73cfcf6dd2530724d3453390ff0dca33874be371f9f934381774d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=restart+android+phone+without+button PDF link annotation
    • https://eco-translation.ca/upload/editor/file/44808531409.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1d4ac421---tatexudizura.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/91598823657.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161458147d99dc---tinuvujasinigunixik.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/51321204704.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/nipedufa.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/33006646904.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210909055924.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/josuzenelajuwe.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/6155566294.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/jijobegikit.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/wudekaregubufonujasezefat.pdfIn PDF document text
    • http://kodemari.info/data/files/gewinuvel.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/bejejinuvawunupotusek.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/giletakonanamolot.pdfIn PDF document text
    • https://regenerateacademy.com/file/61469606394.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/57644620374.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210911061539.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/fefupezu.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/73418816430.pdfIn PDF document text
    • http://fourfoods.com/images/files/28001753565.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/nuvenonatixis.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e69fc7e61---94824799731.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 17976 bytes
SHA-256: 608179f5ecdfd4cfdd963a5e5042ca91ce9d8beac4916a93b7abf988122f361c

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